#include <stdio.h>
int main()
{
	int day, month, year, sum, leap;
	printf("\n请输入年、月、日，格式为：年,月,日（2015-12-10）\n");
	scanf("%d-%d-%d", &year, &month, &day); 
	switch (month) // 先计算某月以前月份的总天数
	{
		case 1:
			sum = 0;
			break;
		case 2:
			sum = 31;
			break;
		case 3:
			sum = 59;
			break;
		case 4:
			sum = 90;
			break;
		case 5:
			sum = 120;
			break;
		case 6:
			sum = 151;
			break;
		case 7:
			sum = 181;
			break;
		case 8:
			sum = 212;
			break;
		case 9:
			sum = 243;
			break;
		case 10:
			sum = 273;
			break;
		case 11:
			sum = 304;
			break;
		case 12:
			sum = 334;
			break;
		default:
			printf("data error");
			break;
	}
	sum = sum + day; // 再加上某天的天数
	if (year % 400 == 0 || (year % 4 == 0 && year % 100 != 0)) // 判断是不是闰年
	{
		leap = 1;
	}
	else
	{
		leap = 0;
	}
	if (leap == 1 && month > 2) // *如果是闰年且月份大于2,总天数应该加一天
	{
		sum++;
	}
	printf("这是这一年的第 %d 天。", sum);
	printf("\n");
}
